<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>
<body>
<div>
    <h1 id="txt">向着星辰进军</h1>
    <button onclick="sayhi()">点击</button>
    <button onclick="addplus()">加</button>
</div>
<script>
    const txt=document.querySelector('#txt');
    function sayhi(){
    //调用鸿蒙里面的方法
      twt.say("hhh")
    }
    function addplus(){
      txt.innerHTML+='-';
   }
</script>
</body>
</html>